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Discord says piracy subpoena would violate users’ First Amendment rights
(www.theverge.com)
This is a most excellent place for technology news and articles.
Validation level is set by server owners, you are unlikely to need to verify a phone number except in the biggest (and therefore spammiest) servers
it doesn't seem to be server specific because once prompted there is no way to use the account again, even if you decided to just not use a server that may have these settings set.
Odd, I've never had that experience. Maybe you're using a VPN or something that makes your IP look more suspicious.
Yeah, I've never needed to add a phone number.